County and Local Transportation Infrastructure Needs

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County and Local Transportation Infrastructure Needs North Dakota Transportation Coalition October 27, 2014 Denver Tolliver Director: Upper Great Plains Transportation Institute

description

UGPTI Director Denver Tolliver provided an update on the Institute’s studies to the North Dakota Transportation Coalition. The updated included an overview of several studies underway, a summary of results and remaining tasks and their timeline for completion.

Transcript of County and Local Transportation Infrastructure Needs

Page 1: County and Local Transportation Infrastructure Needs

County and Local Transportation

Infrastructure Needs

North Dakota Transportation Coalition

October 27, 2014

Denver Tolliver

Director: Upper Great Plains Transportation Institute

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Contents

• Overview of studies

– Roads and bridges

– 4-county study

– Regional railroad study

• Overview of approach

• Summary of results

• Remaining tasks and timeline

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Background

• Third study for legislature and governor

• Requested to present to interim committees:

– Economic Impact

– Energy Development and Transmission

– Budget Section

• Periodic updates for NDDOT

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Key Factors in County Road Study

Oil and Gas Agriculture

Number of wells Cultivated acres

Well locations Crop mix

Production rate/curve Yield

Inputs/outputs Crop densitiesGathering pipeline

Elevator network

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Key Factors in Road Study (cont.)

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Traffic Road

Truck trips Surface type

Truck axles/weights Width & design

ESALs Age & condition

Avg. Daily Traffic Soil

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Infrastructure Data Collection

• Goal: build a consistent county database across state

• Traffic counts and vehicle classifications

• Road geometry [width]

• Road structure [layers, depths, support]

• Current road condition

• Road jurisdiction/ownership

• Bridge attributes

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2013

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Pavement Data Collection

• Condition Data Collection– Collect data with NDDOT pathway van

– 5,600 miles of paved county roads

– Will not collect short segments

– Van will provide consistent pavement distress and ride information

– Collection in July, August, Sep. 2013

Objective – collect pavement distress, ride , strength and geometric information on paved county roads to determine remaining life and projected construction costs

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Pavement Data Collection• Non-Destructive Testing - verify prior estimates on subgrade

strength

– Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR)

– Western ND – all pavements not recently improved

– Eastern ND – selected based on agricultural production facilities and other major traffic generators

– FWD will be done first and GPR will be done on the sites thumped with FWD

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Data Collection: County Survey

• Aggregate (gravel) costs

• Gravel production techniques

• Placement costs

• Transportation costs from pit to roads

• Dust suppressant usage/costs

• Stabilization usage/costs

• Intermediate practices

– Stabilization armor coat

– Double chip seal/armor coat

– Others

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Model Components

UGPTI County and Township Road

Infrastructure Needs

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• 20 year forecasts for agricultural and oil production

• Ag forecasts specific to township and crop

– Reflect county yields and yield forecasts

– Changing crop mix

• Oil forecasts

– Specific to spacing unit

– Reflect filling in over time

– All inputs and outputs

• Baseline traffic

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Drilling Related Truck Movements

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Agricultural Analysis

Crop production

Elevator & plant demands

Known

Known

Truck trips and routesPredict

Segment specific trafficEstimate

Data: crop production (NASS), elevator volumes (NDPSC), in-state processors (survey), road network (NDDOT-GIS Hub), local road data (2008 survey)

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Crop Production and Location

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Wheat Movements

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Gravel Road Analysis• Life-cycle cost analysis - practices

– Graveling and blading

• Normal levels (e.g. regraveling every 5 years, blade once per month)

• Increased levels (e.g. regraveling every 3-4 years, blade twice per month)

• High levels (e.g. regraveling every 2-3 years, blade once per week)

• Usage of dust suppressant on impacted roads

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Paved Road Analysis Process

• AASHTO 1993 Design Guide

• Predict year & type of improvement

• Improvement threshold based on pavement condition

• Year of improvement based on:

– Existing structural capacity

– Existing condition

– Forecasted ESALs (Equiv. Single Axle Loads)

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Paved Road Improvements/Maint.

• Improvement type– Overlay

– Sliver widening

– Reconstruction

– Mine & blend

• Normal maintenance– Chip seals

– Crack sealing and patching

– Other

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County Bridge Analysis

• Current NBI (County and Township)

– Identified structurally deficient and functionally obsolete bridges

– Estimate replacement unit cost from recent ND bridge projects

– Survey counties for biennial maintenance cost

– Forecast replacement of deficient and obsolete bridge

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County and Township Bridges

• 37% are 50 years or older

• Over 20% are structurally deficient; others are functionally obsolete

• 490 bridges with capital improvement needs; almost all immediate

• $329 million of needs ($251 million for replacement)

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Status of County Bridges

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Status (2013) Number Percentage

Not Deficient 1,729 70.11%

Structurally Deficient 552 22.39%

Functionally Obsolete 185 7.5%

Total Bridges 2,466 100%

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Projected Bridge Improvements

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Treatment Number Subtotal

Deck Rehabilitation 4 99

Rehab. & Widening 95

Bridge Replacement 110390

Culvert Replacement 280

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County and Township Roads

• Paved road improvement needs:

– Resurfacing

– Widening

– Reconstruction

– Preservation/ maintenance

• Unpaved road needs

– Accelerated maintenance (graveling and blading)

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County Road Investment Needs by Surface Type ($2014 Million)

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Biennium Gravel Paved Total

2015-2016 $606.40 $395.00 $1,001.40

2017-2018 $547.60 $345.60 $893.20

2019-2020 $547.60 $305.33 $852.93

2015-2034 $5,456.60 $2,744.15 $8,200.75

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County Road Investment Needs by Region ($2014 Million)

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Biennium East West

2015-2016 46% 54%

2017-2018 52% 48%

2019-2020 45% 55%

2021-2022 44% 56%

2015-2034 49% 51%

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Regional Railroad Infrastructure

• 1,200+ miles

• Inherited from Class I railroads

• Mostly light weight rails: age 100+ years

• Important to agriculture and energy

• Accumulated investment needs

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Rail Weights (lb/yd) ND Regional Railroads

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67%

29%

4%

< = 90

100-115

132 >

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Rail Weights: U.S. Class I Railroads

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3%

27%

61%

9%

< 90

100-129

130-139

140+

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Next Steps/Timeline

• Comments on county road study

• 4-county study

• Regional railroad study

• Expected reports to legislature

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